20021211231 has 16 divisors (see below), whose sum is σ = 30514842624. Its totient is φ = 11438318304.

The previous prime is 20021211211. The next prime is 20021211239. The reversal of 20021211231 is 13211212002.

It is not a de Polignac number, because 20021211231 - 2⁶ = 20021211167 is a prime.

It is a super-3 number, since 3×20021211231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20021211231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021211239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7365 + ... + 200241.

It is an arithmetic number, because the mean of its divisors is an integer number (1907177664).

Almost surely, 2^20021211231 is an apocalyptic number.

20021211231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20021211231 is a deficient number, since it is larger than the sum of its proper divisors (10493631393).

20021211231 is a wasteful number, since it uses less digits than its factorization.

20021211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197830.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20021211231 its reverse (13211212002), we get a palindrome (33232423233).

The spelling of 20021211231 in words is "twenty billion, twenty-one million, two hundred eleven thousand, two hundred thirty-one".